Perhaps you should try some spelling variations:
danh hai » dang hai, lanh hai, manh hai
dua tren » dung tren
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
qua cam » qua cham, qua cac, qua ca
cam duc » cam xuc, cao duc, pham duc
va danh » va dinh, va dan, va hanh
cuu tre » cua tre, cau tren, cau treo
sac ky » cac ky, sai ky

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ty) or (sac ky)) nang xa hoi. hieu qua cam duc va danh hai ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sac ky)) nang xa hoi. hieu qua cam duc va danh hai ((dua tren) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sac ky)) nang xa hoi. hieu qua cam duc va danh hai ((dua tren) or (cuu tre))*.